firmware: Add minimal Zephyr application

This is enough to validate that the firmware is running by using the
Zephyr shell.

1 files changed, 6 insertions, 0 deletions

diff --git a/firmware/src/main.c b/firmware/src/main.c
new file mode 100644
index 0000000..7a1076c
--- /dev/null
+++ b/firmware/src/main.c
@@ -0,0 +1,6 @@
+#include <zephyr/kernel.h>
+
+int main(void)
+{
+	return 0;
+}